Velarion Records
The Pay Desk is the free weekly executive pay briefing — one company at a time, every number traceable to a public filing.
You’ll confirm on The Pay Desk’s sign-up page.

Clean Water Act discharge permit · NPDES TX0135917

CHEVRON PHILLIPS CHEMICAL SWEENY OLD OCEAN PLANT, Sweeny, TX: NPDES TX0135917 discharge permit, effluent exceedances, inspections, penalties

CHEVRON PHILLIPS CHEMICAL SWEENY OLD OCEAN PLANT, held by CHEVRON PHILLIPS CHEMICAL CO LP, holds NPDES permit TX0135917, which discharges to Unnamed Trib;Little Ilinnville Bayou. EPA’s file records it issued August 28, 2019 and expiring August 28, 2024. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 15, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.

Identity

Facility as filedCHEVRON PHILLIPS CHEMICAL SWEENY OLD OCEAN PLANT
Permittee as filedCHEVRON PHILLIPS CHEMICAL CO LP
NPDES IDTX0135917
Permit statusEffective
Permit typeIndividual permit
Discharger classMajor discharger
Facility typeNot a publicly owned treatment works
IssuedAugust 28, 2019
Expiration dateAugust 28, 2024
AddressSweeny, TX 77480
Receiving waterUNNAMED TRIB;LITTLE ILINNVILLE BAYOU
SubwatershedBrazos River-Gulf of Mexico (HUC 120701040505)

Cited to the EPA ICIS-NPDES permit file (ECHO download).

Effluent limits and exceedances

An effluent exceedance is a discharge monitoring report value over the permit’s numeric limit (EPA’s violation code E90). A violation of any kind also counts a report not filed. Each row is EPA’s own count for that pollutant; the 60 with the most exceedances of 79 are shown.

Pollutant or measureLimitsViolations, any kindEffluent exceedancesLatest exceedanceLargest exceedance, as filed
pH655March 31, 2025
pH range excursions, > 60 minutes233September 30, 20182,147,483,650% over the limit
BOD, 5-day, 20 deg. C422September 30, 202215% over the limit
Solids, total suspended222January 31, 202390% over the limit
Oil & Grease122July 31, 2025452% over the limit
Flow, in conduit or thru treatment plant811January 31, 202331% over the limit
Zinc, total [as Zn]600
Chlorine, free available600
Whole effluent toxicity - retest #1300
Whole effluent toxicity - retest #2300
Carbon tetrachloride200
Chloroform200
Toluene200
Benzene200
Acenaphthylene200
Acenaphthene200
Acrylonitrile200
Anthracene200
Benzo[b]fluoranthene200
Benzo[k]fluoranthene200
Benzo[a]pyrene200
Chlorobenzene200
Chloroethane, total weight200
Chrysene200
Diethyl phthalate200
Dimethyl phthalate200
Ethylbenzene200
Fluoranthene200
Fluorene200
Hexachlorobutadiene200
Hexachloroethane200
Methyl chloride [Chloromethane]200
Methylene chloride200
Nitrobenzene200
Phenanthrene200
Pyrene200
Tetrachloroethylene200
1,1-Dichloroethane200
1,1-Dichloroethylene200
1,1,1-Trichloroethane200
1,1,2-Trichloroethane200
Benzo[a]anthracene200
1,2-Dichloroethane, total weight200
1,2-Dichlorobenzene200
1,2-Dichloropropane200
trans-1,2-Dichloroethylene200
1,2,4-Trichlorobenzene200
1,3-Dichloropropene, total weight200
1,3-Dichlorobenzene200
1,4-Dichlorobenzene200
2-Nitrophenol200
2,4-Dimethylphenol200
2,4-Dinitrophenol200
4-Nitrophenol200
4,6-Dinitro-o-cresol200
Phenol200
Naphthalene200
Di[2-ethylhexyl] phthalate [DEHP]200
Di-n-butyl phthalate200
Vinyl chloride200

Cited to the EPA ICIS-NPDES limits and effluent violations files (ECHO download); up to 60 rows shown, most exceedances first.

Inspections, violations and enforcement

DateWhat EPA recordedAgency
June 6, 2023Permit Violations - Violation Specified in CommentST6
January 10, 2019Permit Violations - Violation Specified in CommentST6

Velarion’s copy of EPA’s ICIS-NPDES files does not include the inspections, formal enforcement actions and informal enforcement actions files, so this page shows none of them. EPA’s free Detailed Facility Report on ECHO lists this permit’s inspections, enforcement actions and penalties.

Cited to the EPA ICIS-NPDES violation, inspection and enforcement files (ECHO download); up to 50 rows of each shown, newest first.

Watch this permit

One permit holder, $99/month. Watch the register for one permit holder and the places and receiving waters tied to its permits. Choose “One permit holder” and enter this permit’s NPDES ID, TX0135917.

Start the watch

How often?
  • One permit holder — $99/month
  • One watershed — $2,990/year
  • One state — $4,990/year
  • The whole register — $18,000/year

How we handle your data → Privacy

EPA publishes a free Detailed Facility Report for every permit on ECHO: its compliance status quarter by quarter, its inspections, and its enforcement actions and penalties. EPA also sends free notices of new inspections and enforcement actions through ECHO Notify; enter NPDES ID TX0135917 there.

Nearby on the register

Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.